Screw-driver.



C. E. MITCHELL.

SCREW DRIVER.

APPLIOATION FILED MAY 13, 190s.

Paten@ Apr. 13, 1909.

THE NaRms PETE'R nnnnnnnnnnnnnnnnnnn c.

UNITED STATES PATENI CHARLES E. MITCHELL, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEY RULE 8: LEVEL COMPANY, OF NEW BRITAIN, CONNECTICUT, I CORPORATION OI" CONNECTICUT.

' SCREW-DRIVER.

Specicaton of Letters Patent.

Application filed May 13, 1908.

Patented April 13, 1909.

Serial No. 432,572.

To all whom it may concern:

Be it known that I, CHARLES E. MITCHELL, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Screw-Drivers, of which the following is a full, clear, and exact description.

My invention relates to improvements in screw-drivers, the object being to improve the same structurally, whereby the handle and shank are eiectively connected and held against independent rotation, said connecting means being also employed as a handlereinforcing means to guarantee against splitting when subjected to severe use.

In practice, the butt end of screw-driver handles are frequently used for starting screws by striking the screw head with the end of the screw-driver handle. In other instances, the end of the screw-driver is sometimes struck with a hammer. It is this sort of severe usage that frequently results in the cracking or splitting of the handle. By my improvement, much greater strength is added to this portion, so that it will more eectively resist this usage` In the past, in devices of this character, it has been customary to form serrations or wings upon the shank of the screw-driver, where it enters the handle or grip portion, these being designed to cut into the material to lock the parts against independent rotation. This frequently unduly strains the handle and results in cracking the same open. This wing construction also involves additional expense. By my invention this danger and expense is eliminated.

In the drawings, Figure 1 is a side elevation of the screw-driver complete. Fig. 2 is a similar view, the handle being in section on the plane of the line x-x of Fig. 1.

1 represents the metal shank of the screwdriver, the same being round in cross section throughout, and provided at its butt end witha head 2 preferably formed inteeral therewith and circular in outline, though the shape is immaterial.

3 represents a gri portion or handle of suitable form, tapere toward its forward end to receive a ferrule 4.

5 is a ring located upon the handle inter- Ahandle 3 and shank 1.

In assembling the parts, the handle 1 is bored to receive the shank. The latter, being preferably smooth and regular externally, may be readily inserted into the handle l without danger of splitting the same, and yet snugly enough to prevent any danger of looseness. Borings are then made for the pins 6 and 7. These pins 6 and 7 perform several functions. They hold the respective external reinforcements 4 and 5 in place, said reinforcements permitting the ends of said pins to be headed up ei'fectively so as to not pull through the material of the handle. The pins also act as keys to prevent the shank 1 from turning in the handle 3. They also act as means to prevent the handle 3 sliding longitudinally on the shank 1.

Substantial economies are attained by this arrangement, and the finished pro duct is sup erior in strength and appearance. If the user desires to pound with the handle 3, he may do so with very little danger of splitting or injuring the same. Furthermore, if the screw-driver is struck on the end with a hammer, it withstands such blows most effectively.

The ferrule 4 should preferably fit snugly upon the shank l as well as the inclosed end of the grip 3. The head 2 on the shankis preferably of substantial thickness and is likewise preferably squared up on its lower side, the rear end of the grip or handle 8 being recessed to receive said head 2, so that the same will lie substantially flush with the rear extremity of said handle.

What I claim is:

A screw driver comprising a round shank havino a head at one end, a handle having a centra bore adapted to receive said shank and being counterbored to receive said shank head, the forward end of said handle being tapered, a errule overstanding the extreme just above said ring and a holding pin passing forward end of the handle, a holding pin through said ring, handle and shank.

passing through said errule handle and 1 n n f 11 shank, a relnforoing ring arranged at a point CHARLES 'n' UTCHLL' 5 intermediate the length of the handle and of Il fVitnesses:

greater diameter than the diameter of' said l W. J. ORML' ferrule, an abutment shoulder on the handle l H. S. WALTER 

